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[Android] Add mechanism for setting Android engine flags via Android manifest (take 2) (#181632 )

A continuation of https://github.com/flutter/flutter/pull/177127.
Copying from there:

# Overview

> [!NOTE]  
> This PR is based on conversation & feedback on
go/flutter-android-harden-engine-shell-arguments.

Adds a mechanism for setting Android engine flags via the manifest. If a
flag is specified on the command line and in manifest metadata, the
value specified on the command line will take precedence. Documentation
is added on this mechanism

Additionally, this PR removes the exposure of`--cache-sksl` command line
flag as per
[https://github.com/flutter/flutter/issues/140310#issuecomment-2708459007](https://www.google.com/url?q=https://github.com/flutter/flutter/issues/140310%23issuecomment-2708459007&sa=D&source=docs&ust=1761156167162464&usg=AOvVaw3a8ubXTtv3apknY2-P9dKe).

Additionally, this PR adds documentation for the only two supported ways
of setting engine flags moving forward -- via the command line or
manifest. The `Intent` mechanism will be removed when
https://github.com/flutter/flutter/issues/180686 is completed (intended
to be a follow up to this PR).

As the unit tests in this PR only cover setting flags via manifest in
debug mode, I will follow up this PR with an integration test to test
that flags are appropriately respected/ignored in release mode. See
https://github.com/flutter/flutter/pull/178383 for my currently working
but WIP draft.

Part of https://github.com/flutter/flutter/issues/172553.

# Follow up work:

## Add integration test for this new added mechanism
This will land as an immediate follow-up to this PR. WIP in
https://github.com/flutter/flutter/pull/178383.

## Remove support for setting shell arguments via `Intent`
This task will be a follow up to this work + the integration test
landing, and will complete work for
https://github.com/flutter/flutter/issues/172553. See
https://github.com/flutter/flutter/issues/180686 for details.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

**Note**: The Flutter team is currently trialing the use of [Gemini Code
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Comments from the `gemini-code-assist` bot should not be taken as
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<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md